Alfresco 4.0.e Share access error

when to trying to access share , get an error . /alfresco works fine, can see all sites . The issue started when trying to roll back after failed 4.2.b upgrade , database/data folder has been restored back to old one .

A server error has occured.

There are a number of reasons why this could have happened:You have attempted to access a page that does not exist - check the URL in the address bar.You have attempted to access a page that is not accessable to you, such as a private Site dashboard.A valid page has been requested but the server was unable to render it due to an internal error - contact your administrator.Alfresco Log shows :